1561261653 has 24 divisors (see below), whose sum is σ = 2583854208. Its totient is φ = 889888032.

The previous prime is 1561261627. The next prime is 1561261687. The reversal of 1561261653 is 3561621651.

It is not a de Polignac number, because 1561261653 - 2⁸ = 1561261397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561261693) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6201 + ... + 56222.

It is an arithmetic number, because the mean of its divisors is an integer number (107660592).

Almost surely, 2^1561261653 is an apocalyptic number.

It is an amenable number.

1561261653 is a deficient number, since it is larger than the sum of its proper divisors (1022592555).

1561261653 is a wasteful number, since it uses less digits than its factorization.

1561261653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62833 (or 62830 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 1561261653 is about 39512.8036590673. The cubic root of 1561261653 is about 1160.0905728427.

The spelling of 1561261653 in words is "one billion, five hundred sixty-one million, two hundred sixty-one thousand, six hundred fifty-three".